Two of Hearts | Omegaverse Batjokes

Ah- I mean you already read the title... I plan this to be either a one-shot or a short story cause I'm horny and I like omegaverse :)

Anyway if you do want an actual description, I should at least give you some context:
This is the kind of world where alphas and omegas have rather than a "destinated partner", various people who are compatible or not depending if they match their exact same heat period. If an alpha and an omega match, the alpha can mark their omega by bitting their neck and leaving a scar, this will "monopolize" both of them's heat to each other.

The known ex-playboy Bruce Wayne already has a partner who is compatible with him, Selina, but he hasn't marked her yet for unknown reasons, but he trusts no one he knows share the same cycle... right?

Joker is a free soul, he doesn't take any medication ever. He does whatever he wants, whenever he wants, and he loves leaving alphas salivating over him at any chance given.

Betas are actually free of all of this shenanigans so they can live their lifes in peace.